Hypodermic syringe and means for retaining same



Sept. 4, 1928. 1,683,349 G. N. HEIN HYPODERMIC SYRINGE AND MEANS FORRETAINING SAME Filed loct. 4. 1926 mmmmwv mmm! BY gli? m* ZTTORNEYS.

fill

Patented Sept. 4, 1928.

UNTED STATES V(':-IlOltGE N. HEIN, OF SAN FRANCISCO, CALIFORNIA. Y

HYPODERMIC SYRINGE AND MEANS FOR RETAINING SAME. i

Application filed October 4. 1926. Serial No. 139,245;

This invention relates to Vhypodermic needles, and more particularly toa coupling or retaining means for the needle.

The object of this'invention isV to provide a hypodermic needle that caneasily and quickly be attached to a hypodermic syringe,

making a leak-proof connection without the use or' Vthe presentconventional Wrench. The construction of this needle-is such as to makeit unnecessary to provideany depressions or projections on thesurface ofthe needle base to use Jfor tightening purposes, leavingl the surface..of said needle base smooth and tapering, giving the operator clearvision of his Work and making sterilization more easily retained.

Needles now in general use with an adapter require that the adapterberemoved to insert the needle, making it necessary to replace the sametogether on the syringe base. This arrangement is cumbersome andtime-wasting, and the needle point is frequently injured when passedthrough the adapter.

With the present invention, the needle base is quickly and positivelyinserted into the adapter without necessitatingv removal of tlie samefrom the syringe. A fraction of a turn of the adapter positively seatsand locks the needle into place, making a leakproof joint. To remove theneedle, only a slight reverse turn of the adapter is needed. This needlemay also be advantageously used directly on the syringe base without anintervening adapter. In this case there is the necessity of a largerthumb-piece on the needle base, making it possible for the operator tonot only seat the needle into a leak-proof position, but also locking itpositively, preventing any danger of the needle blowing off whenpressure is employed through `the act of injecting.

In the accompanying drawing,

Figs. 1 and 2 show central longitudinal sectional views of a syringe andneedle embodying one form of my invention;

Figs. 3 and 4 show similar views of a modiiied form;

Figs. 5 and 6 show similar views of a still further modification;

Figs. 7 8, and 9 show longitudinal central sectional views of variousother modiications.

The syringe comprises a barrel 10 and needle 11. The needle shown is ofthe Luer type, with a conical stein 12 adapted to enter a conical socket13 on the end of the barrel.r v

In all such devices of this type it is desirable that the needle beseatedwith a turn or twist, so as to Wipe the joint. At the same time ithas to be locked in position to prevent blowing off when the contentsof. thesyringe is ejected.v .f

`Locking devices heretofore in use gener-- ally require some sort of aWrench, or Where a tapered .or other locking means is provided, it isgenerally'necessary to completely remove the same, in order to detachthe needle.

As shown in Figs. 1 and 2, Iprovide a barrel with a coupling 14 threadedonto the stem 15701:' the barrel. This coupling member has a threadedsocket to receive a threaded portion 16 on the base of the needle. Thethreads on the parts and 16 are oppositely directed, and in opera-tionthe needle is' first threaded onto the coupling member 14 at a time whenthe latter is slacked oil as shown in Fig. 2. VWhen the needle has vbeencompletely threaded onto the coupling member, then the latter is rotatedin the opposite direction, so as to y thread onto the stem 15, thuscarrying the tapered stem 12 of the needley into a close, binding fitwith the socket 13. Y

In Figs. 5 and 6, instead of threading the needle base onto the couplingmember 14, I thread the needle onto a socket 17 formed on the stem ofthe barrel. The vcoupling member is so constructed that it has' anangular socket 18 to receive an angular face 19 on the base of theneedle, so that when the coupling member is rotated it will act like aWrench, to thread the needle onto the barrel.

In Figs. 3 and 4 I dispense with the threads between the coupling memberand the barrel, and substitute therefor a groove 20 on the stem of thebarrel, into which groove is fitted a ring21 on the end of the couplingmember, said ring being formed by beading the end of the couplingmember. In other respects the coupling member of Figs.

3 and 4 is similar to the one shown in Figs.

5 and 6. e

In Figs. 7 and 8, the needle is threaded directly onto the stem of thebarrel.

Fig. 9 shows a needle having threads on the base, the base being formedwith a tapered socket to receive a tapered nipple 22 on the end of thesyringe barrel. The

threads on the needle base eo-operate with threads 23 on a sleeve orguard Q4, which surrounds and protects the syringe barrel.

Having thus described my invention, what claim as new and desire tosecure by Let-v ters Patent is: t

l. In a hypodermie syringe, a barrel and a detachable needle therefor,the latter formed with a smooth, tapered stem to enter a tapered socketon the barrel, and a'eoupling member beween the needle and barrel havingmeans to rotate the needle and cause the tapered stem to vseat'in thesocket with a wiping' effect, sa'd Coupling device being' operative torelease the needle without be-` ing removed from the barrel.

2, In a hypodermie syringe,a barrel and a detachable needle therefor,the latter formed with a tapered stem to enter ataperedV socket in thebarrel, and a coupling between the needle and barrel, rotatably re('ei'ved on the latter and having a connectlon with the needle to rotatethe latter when the Coupling member is turned on the barrel, the outerend of said lcoupling; member being open to receive the needle basewithout removing said Coupling` member from the barrel.

3. A hypodermie syringe having a barrel and a detachable needle, thelatter being formed with a smooth, tapered stem to enter a taperedsoolet onvthe barrel, and a,coupling member having a threaded connectionwith the barrel and also a threaded Connec-y tion with the needle, thethreads' between the Coupling member and barrel being oppositelyldirected to the threads between the coupling member and needle, wherebywhen the coupling member is screwed onto thev barrel, the needle will'be rotated, causing the tapered stem to seat in the tapered soeket witha wiping effect. w

GEORGE N.

